body {
    background-size: cover;
}

/* 标题 */
.bt {
    text-align: center;
    font-size: 50px;
    right: 10px;

}

/* 基本介绍 优势 劣势 历史 */
#guide {
    font-size: 40px;
    position: fixed;
    color: #09ad17;
    position: fixed;
    clear: both;
    float: left;
    display: flex;
    flex-direction: column;
    line-height: 100px;
}

button {
    margin-top: 50px;
    background: #eb94d0;

    background-image: -webkit-linear-gradient(top, #eb94d0, #2079b0);
    background-image: -moz-linear-gradient(top, #eb94d0, #2079b0);
    background-image: -ms-linear-gradient(top, #eb94d0, #2079b0);
    background-image: -o-linear-gradient(top, #eb94d0, #2079b0);
    background-image: linear-gradient(to bottom, #eb94d0, #2079b0);

    -webkit-border-radius: 28;
    -moz-border-radius: 28;
    border-radius: 28px;
    text-shadow: 3px 2px 1px #9daef5;
    -webkit-box-shadow: 6px 5px 24px #666666;
    -moz-box-shadow: 6px 5px 24px #666666;
    box-shadow: 6px 5px 24px #666666;
    font-family: Arial;
    color: #fafafa;
    font-size: 27px;
    padding: 19px;
    text-decoration: none;
}

.btn:hover {
    background: #2079b0;
    background-image: -webkit-linear-gradient(top, #2079b0, #eb94d0);
    background-image: -moz-linear-gradient(top, #2079b0, #eb94d0);
    background-image: -ms-linear-gradient(top, #2079b0, #eb94d0);
    background-image: -o-linear-gradient(top, #2079b0, #eb94d0);
    background-image: linear-gradient(to bottom, #2079b0, #eb94d0);
    text-decoration: none;
}


/*文字 */
.wenzi {
    line-height: 60px;
    margin-left: 450px;
    width: 900px;
    text-align: left;
    font-size: 20px;
    margin-top: 100px;
    margin-bottom: 500px;

    color: azure;


}

* {
    margin: 0;
    padding: 0;
}

h1{
    text-align: center;
}

.h3 {
    font-family: 华文仿宋;
}

nav {
    top: 1px;
    right: 9px;
    position: fixed;
    width: 150px;
    margin: 10px;
    background: #3ab5ee;
}

.list ul {
    border: 1px solid rgb(226, 230, 40);
}

.list ul li {
    list-style-type: none;
    font-family: 幼圆;
}

.list li+li a {
    border-top: 1px solid rgb(6, 101, 190);
}

.list ul li a {
    text-align: center;
    text-decoration: none;

    color: #0a0202;
    display: block;
    padding: 3px 10px;
}

.list ul li a:hover {
    color: rgb(22, 216, 80);
    background: #9c71d4;
    cursor: pointer;
}

.p {
    border-style: solid;
    border: #0a0202;
}

#back{
    font-size: 100px;
    display: inline-block;
    cursor: pointer;
    color: white;
    position: fixed;
}